err: req for member in something not struct

K

Kyle Blake

I am writing a parser using flex & bison, however this appears to be a C
problem.
GCC gives the following error:
error: request for member file in something not a structure or union

The offending structure is declared as:

typedef struct YYLTYPE
{
int fl;
int fc;
int ll;
int lc;
char* file;
} YYLTYPE;
/* Apparently, bison wants it to be a macro */
#define YYLTYPE YYLTYPE

The reference that caused the error is the expansion of the following macro,
an adaption of the default one provided with bison:

#define YYLLOC_DEFAULT(Current, Rhs, N) \
do \
if (N) \
{ \
(Current).fl = YYRHSLOC(Rhs, 1).fl; \
(Current).fc = YYRHSLOC(Rhs, 1).fc; \
(Current).ll = YYRHSLOC(Rhs, N).ll; \
(Current).lc = YYRHSLOC(Rhs, N).lc; \
(Current).file = YYRHCLOC(Rhs, 1).file; \
} \
else \
{ \
(Current).fl = (Current).ll = \
YYRHSLOC(Rhs, 0).ll; \
(Current).fc = (Current).lc = \
YYRHSLOC(Rhs, 0).lc; \
(Current).file = YYRHSLOC(Rhs, 0).file; \
} \
while (0)

Current, YYRHCLOC(Rhs, 1), and YYRHCLOC(Rhs, N) are all of type YYLTYPE.
None of them are pointers.
It compiles fine if I comment out the line:
(Current).file = YYRHCLOC(Rhs, 1).file;
Even though file is still referenced in the else block.

Any ideas?
 
N

Nate Eldredge

Kyle Blake said:
I am writing a parser using flex & bison, however this appears to be a C
problem.
GCC gives the following error:
error: request for member file in something not a structure or union
Click to expand...

It's hard to tell from looking at that snippet. Can you post the
complete bison input?
 
K

Kyle Blake

Nate said:
It's hard to tell from looking at that snippet. Can you post the
complete bison input?
Click to expand...

Here it is:

***dconf-parser.y***
%{
#include <stdio.h>
#include "util.h"
#define YYLLOC_DEFAULT(Current, Rhs, N) \
do \
if (N) \
{ \
(Current).fl = YYRHSLOC(Rhs, 1).fl; \
(Current).fc = YYRHSLOC(Rhs, 1).fc; \
(Current).ll = YYRHSLOC(Rhs, N).ll; \
(Current).lc = YYRHSLOC(Rhs, N).lc; \
(Current).file = YYRHCLOC(Rhs, 1).file; \
} \
else \
{ \
(Current).fl = (Current).ll = \
YYRHSLOC(Rhs, 0).ll; \
(Current).fc = (Current).lc = \
YYRHSLOC(Rhs, 0).lc; \
(Current).file = YYRHSLOC(Rhs, 0).file; \
} \
while (0)

%}

%token IDENT
%token STRING
%token CHAR
%token INT
%token YNM
%token NONE
%token BAD_INCLUDE
%token CONFIG
%token NAME
%token TYPE
%token TYPE_YN
%token TYPE_YNM
%token TYPE_INT
%token TYPE_STRING
%token TYPE_SELECT
%token TYPE_XSELECT
%token TYPE_DSELECT
%token DEFAULT
%token HELP
%token MORE
%token DEPENDS

%error-verbose
%defines
%locations

%%

start: /* empty */
| start config
;

config: ';'
| CONFIG IDENT '{' stmnts '}'
| CONFIG NONE '{' stmnts '}'
| CONFIG YNM '{' stmnts '}'
| CONFIG error
| error
;

stmnts: /* empty */
| stmnts stmnt ';'
| stmnts error ';'
;

stmnt: /* empty */
| name
| type
| default
| help
| depends
| BAD_INCLUDE {yyerror("could not include file"); YYERROR;}
;

name: NAME STRING
| NAME CHAR
| NAME error
;

type: TYPE TYPE_YN
| TYPE TYPE_YNM
| TYPE TYPE_INT
| TYPE TYPE_STRING
| TYPE TYPE_SELECT
| TYPE TYPE_XSELECT
| TYPE TYPE_DSELECT
| TYPE error
;

default: DEFAULT YNM
| DEFAULT INT
| DEFAULT STRING
| DEFAULT IDENT
| DEFAULT error
;

help: HELP STRING
| HELP CHAR
| HELP MORE
| HELP error
;

depends: DEPENDS expr
| DEPENDS error

expr: ;

***util.h***

#ifndef _UTIL_H_
#define _UTIL_H_

#include <stdio.h>

void
yyerror(const char* str);

#define YYSTYPE char*

typedef struct YYLTYPE
{
int fl;
int fc;
int ll;
int lc;
char* file;
} YYLTYPE;

/* Apparently, bison wants it to be a macro */
#define YYLTYPE YYLTYPE

#endif

***util.c***

void
yyerror(const char* str)
{
fprintf(stderr,
"dconf: %s (%d,%d-%d,%d)\n",
str,
yylloc->fl, yylloc->fc,
yylloc->ll, yyloc->lc);
}


Hope that helps.
 
V

vippstar

Here it is:

***dconf-parser.y***
%{
#include <stdio.h>
#include "util.h"
#define YYLLOC_DEFAULT(Current, Rhs, N) \
do \
if (N) \
{ \
(Current).fl = YYRHSLOC(Rhs, 1).fl; \
(Current).fc = YYRHSLOC(Rhs, 1).fc; \
(Current).ll = YYRHSLOC(Rhs, N).ll; \
(Current).lc = YYRHSLOC(Rhs, N).lc; \
(Current).file = YYRHCLOC(Rhs, 1).file; \
} \
else \
{ \
(Current).fl = (Current).ll = \
YYRHSLOC(Rhs, 0).ll; \
(Current).fc = (Current).lc = \
YYRHSLOC(Rhs, 0).lc; \
(Current).file = YYRHSLOC(Rhs, 0).file; \
} \
while (0)

%}

%token IDENT
%token STRING
%token CHAR
%token INT
%token YNM
%token NONE
%token BAD_INCLUDE
%token CONFIG
%token NAME
%token TYPE
%token TYPE_YN
%token TYPE_YNM
%token TYPE_INT
%token TYPE_STRING
%token TYPE_SELECT
%token TYPE_XSELECT
%token TYPE_DSELECT
%token DEFAULT
%token HELP
%token MORE
%token DEPENDS

%error-verbose
%defines
%locations

%%

start: /* empty */
| start config
;

config: ';'
| CONFIG IDENT '{' stmnts '}'
| CONFIG NONE '{' stmnts '}'
| CONFIG YNM '{' stmnts '}'
| CONFIG error
| error
;

stmnts: /* empty */
| stmnts stmnt ';'
| stmnts error ';'
;

stmnt: /* empty */
| name
| type
| default
| help
| depends
| BAD_INCLUDE {yyerror("could not include file"); YYERROR;}
;

name: NAME STRING
| NAME CHAR
| NAME error
;

type: TYPE TYPE_YN
| TYPE TYPE_YNM
| TYPE TYPE_INT
| TYPE TYPE_STRING
| TYPE TYPE_SELECT
| TYPE TYPE_XSELECT
| TYPE TYPE_DSELECT
| TYPE error
;

default: DEFAULT YNM
| DEFAULT INT
| DEFAULT STRING
| DEFAULT IDENT
| DEFAULT error
;

help: HELP STRING
| HELP CHAR
| HELP MORE
| HELP error
;

depends: DEPENDS expr
| DEPENDS error

expr: ;

***util.h***

#ifndef _UTIL_H_
#define _UTIL_H_

#include <stdio.h>

void
yyerror(const char* str);

#define YYSTYPE char*

typedef struct YYLTYPE
{
int fl;
int fc;
int ll;
int lc;
char* file;

} YYLTYPE;

/* Apparently, bison wants it to be a macro */
#define YYLTYPE YYLTYPE

#endif

***util.c***

void
yyerror(const char* str)
{
fprintf(stderr,
"dconf: %s (%d,%d-%d,%d)\n",
str,
yylloc->fl, yylloc->fc,
yylloc->ll, yyloc->lc);

}

Hope that helps.
Click to expand...

Well, first of all, flex/bison is not on-topic here. Nor is its
output.
I don't have any knowledge of those programs; I do know C however, and
just by my C knowledge, I can not spot the mistake in your "code".
However, in yyerror, you have yylloc-> and yyloc-> (notice the single
'l'). Is that intentional?

Regardless, as I've said your post is off-topic and even if you do get
help you shouldn't post here in the future about flex/bison queries. I
don't know where such messages would be on-topic.
 
K

Kyle Blake

Well, first of all, flex/bison is not on-topic here. Nor is its
output.
I don't have any knowledge of those programs; I do know C however, and
just by my C knowledge, I can not spot the mistake in your "code".
However, in yyerror, you have yylloc-> and yyloc-> (notice the single
'l'). Is that intentional?

Regardless, as I've said your post is off-topic and even if you do get
help you shouldn't post here in the future about flex/bison queries. I
don't know where such messages would be on-topic.
Click to expand...

The single 'l' is a mistake.
I do not believe that it is off-topic, as it is the C part that has the
problem, not the bison part.
 
B

Ben Bacarisse

Kyle Blake said:
I am writing a parser using flex & bison, however this appears to be a C
problem.

GCC gives the following error:
error: request for member file in something not a structure or union

The offending structure is declared as:

typedef struct YYLTYPE
{
int fl;
int fc;
int ll;
int lc;
char* file;
} YYLTYPE;
/* Apparently, bison wants it to be a macro */
#define YYLTYPE YYLTYPE

The reference that caused the error is the expansion of the following macro,
an adaption of the default one provided with bison:

#define YYLLOC_DEFAULT(Current, Rhs, N) \
do \
if (N) \
{ \
(Current).fl = YYRHSLOC(Rhs, 1).fl; \
(Current).fc = YYRHSLOC(Rhs, 1).fc; \
(Current).ll = YYRHSLOC(Rhs, N).ll; \
(Current).lc = YYRHSLOC(Rhs, N).lc; \
(Current).file = YYRHCLOC(Rhs, 1).file;
Click to expand...

I think you are missing an S -- YYRHCLOC is not the same as
YYRHSCLOC used in the other cases. If you turn up warnings the
compiler will complain about an undefined function.
 
K

Kyle Blake

Ben said:
I think you are missing an S -- YYRHCLOC is not the same as
YYRHSCLOC used in the other cases. If you turn up warnings the
compiler will complain about an undefined function.
Click to expand...
That fixed it, thanks.
 

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